#!/usr/bin/env bash

# We want to catch any unexpected failure, and exit immediately
set -e

# Download helper for cvs, to be called from the download wrapper script
#
# Options:
#   -q          Be quiet
#   -o FILE     Generate archive in FILE.
#   -u URI      Checkout from repository at URI.
#   -c REV      Use revision REV.
#   -N RAWNAME  Use rawname (aka module name) RAWNAME.
#   -n NAME     Use basename NAME.
#
# Environment:
#   CVS      : the cvs command to call

verbose=
while getopts "${BR_BACKEND_DL_GETOPTS}" OPT; do
    case "${OPT}" in
    q)  verbose=-Q;;
    o)  output="${OPTARG}";;
    u)  uri="${OPTARG}";;
    c)  rev="${OPTARG}";;
    N)  rawname="${OPTARG}";;
    n)  basename="${OPTARG}";;
    :)  printf "option '%s' expects a mandatory argument\n" "${OPTARG}"; exit 1;;
    \?) printf "unknown option '%s'\n" "${OPTARG}" >&2; exit 1;;
    esac
done

shift $((OPTIND-1)) # Get rid of our options

# Caller needs to single-quote its arguments to prevent them from
# being expanded a second time (in case there are spaces in them)
_cvs() {
    eval ${CVS} "${@}"
}

if [[ ${rev} =~ ^[0-9] ]]; then
    # Date, because a tag or a branch cannot begin with a number
    select="-D"
else
    # Tag or branch
    select="-r"
fi

# The absence of an initial : on ${uri} means access method undefined
if [[ ! "${uri}" =~ ^: ]]; then
   # defaults to anonymous pserver
   uri=":pserver:anonymous@${uri}"
fi

export TZ=UTC
_cvs ${verbose} -z3 -d"'${uri}'" \
     co "${@}" -d "'${basename}'" ${select} "'${rev}'" -P "'${rawname}'"

tar czf "${output}" "${basename}"